In the years leading up to WWII, the French built the Maginot Line as an impregnable barrier against a German invasion:

While the fortification system did prevent a direct attack, it was strategically ineffective, as the Germans invaded through Belgium, going around the Maginot Line.

Copyright maximalists such as the major academic publishers, are in a similar position. The more effective and thus intrusive the mechanisms they implement to prevent unauthorized access, the more they incentivize “guerilla open access”.